* {
  margin: 0;
  padding: 0;
}
html,
body {
  width: 100%;
  height: 100%;
}
.box {
  width: 100%;
  height: 50px;
  text-align: center;
  line-height: 50px;
  font-family: Microsoft Yahei;
}
.sum {
  display: flex;
  height: 100%;
  width: 100%;
  position: relative;
}
.box2 {
  height: 100%;
  width: 100%;
  background-image: url("腾讯会议图片_20221204154725.jpg");
  background-size: cover;
  background-position: center;
}
.text {
  position: absolute;
  color: white;
  font-size: 30px;
  font-weight: bold;
  left: 76px;
  bottom: 144px;
  animation: txt 1s forwards;
}
.logindiv {
  width: 105px;
  height: 40px;
  border-radius: 20px;
  background-color: white;
  position: absolute;
  right: 20px;
  top: 20px;
  display: flex;
  justify-content: space-around;
}
.logindiv1 {
  width: 16px;
  height: 20px;
  margin-top: 10px;
  margin-left: 11px;
}
.logindiv2 {
  width: 1px;
  height: 25px;
  background-color: black;
  margin-top: 8px;
}
.logindiv3 {
  width: 28px;
  height: 20px;
  margin-top: 11px;
  margin-right: 10px;
  font-size: 14px;
}
@keyframes txt {
  0% {
    opacity: 0;
    transform: translateY(0px) scale(0.8);
  }
  25% {
    opacity: 0.6;
    transform: translateY(50px) scale(0.85);
  }
  100% {
    opacity: 1;
    transform: translateY(10px) scale(1.2);
  }
}
